Affiliation: | 1. Department of Behavioral Sciences, Committee on Human Development, The University of Chicago, 5730 South Woodlawn Avenue, Chicago, Illinois 60637, U.S.A.;2. Department of Psychology, University of Turin, Center for Research in Human Cultural Evolution and Behavioral Development, Instituto Di Psicologia Della Facolta Medica Dell''Universita Degli Studi Di Milano, 20122 Milano, Via Francesco Sforza, 23, Italy |